CN102725537A - Steam supply system and check valve used for same - Google Patents

Steam supply system and check valve used for same Download PDF

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Publication number
CN102725537A
CN102725537A CN2010800446949A CN201080044694A CN102725537A CN 102725537 A CN102725537 A CN 102725537A CN 2010800446949 A CN2010800446949 A CN 2010800446949A CN 201080044694 A CN201080044694 A CN 201080044694A CN 102725537 A CN102725537 A CN 102725537A
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China
Prior art keywords
steam
valve
road
aforementioned
safety check
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Granted
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CN2010800446949A
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CN102725537B (en
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松川直树
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TLV Co Ltd
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TLV Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
    • F22B37/446—Safety devices responsive to overpressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K2200/00—Details of valves
    • F16K2200/30—Spring arrangements
    • F16K2200/305—Constructional features of springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7925—Piston-type valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7929—Spring coaxial with valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7929—Spring coaxial with valve
    • Y10T137/7932—Valve stem extends through fixed spring abutment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87571—Multiple inlet with single outlet
    • Y10T137/87587—Combining by aspiration
    • Y10T137/87643—With condition responsive valve

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Check Valves (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Safety Valves (AREA)

Abstract

The control accuracy of steam by means of a pressure reducing valve is enhanced. Provided is a steam supply system which is configured in such a manner that re-evaporated steam (FS) in a re-evaporation tank (2) is sucked by a steam ejector (4) and mixed with passing steam (S') in a form that a pressure reducing valve (3) is interposed in a steam supply passage (1), the steam ejector (4) is interposed on the downstream side of the pressure reducing valve (3) in the steam supply passage (1), a suction section (4a) of the steam ejector (4) and the re-evaporation tank (2) for re-evaporating condensate (D1) are connected by a suction passage (9), and the passing steam (S') of the pressure reducing valve (3) is set as the driving steam of the steam ejector (4), and in which a check valve (10) for suppressing the back-flow of the steam to the re-evaporation tank (2); is interposed in the suction passage (9). The steam supply system is configured in such a manner that the valve opening of the pressure reducing valve (3) is adjusted according to the temperature or pressure of the steam on the downstream side of the steam ejector (4) in the steam supply passage (1), and has a structure in which the check valve (10) has specific flow rate characteristics in which the increasing rate of flow rate along with an increase in the valve opening of the check valve is equivalent between a small opening region with a small valve opening and a large opening region with a large valve opening, or specific flow rate characteristics in which the increasing rate of the flow rate is less in the small opening region than in the large opening region.

Description

Steam supply system and the safety check that is used for the steam supply system
Technical field
The present invention relates to be used for use machine to supply with the steam supply system and the safety check that is used for the steam supply system of steam to steam at equipment such as steam plants.
Background technique
All the time; As this steam supply system; Steam supply system below known: the steam that uses machine to supply with steam to steam supply with the road get involved reduction valve is installed, get involved in the downstream side that aforementioned steam is supplied with the reduction valve in the road vapor steam blaster is installed, by attracting the road to connect the attraction portion of this vapor steam blaster and making evaporating pot again that condensed water evaporates again, attract again the steam of evaporation again in the evaporating pot by vapor steam blaster as the mode of the driving steam of vapor steam blaster and mix through steam with aforementioned with the steam that passes through with aforementioned reduction valve; And; Get involved installation on aforementioned attraction road and suppress the safety check (for example, with reference to following patent documentation 1) of steam to the adverse current of aforementioned evaporating pot again.
Promptly; This steam supply system by intervention be installed on steam supply with the road vapor steam blaster sucking action and again the steam that evaporates again in the evaporating pot apply flexibly in the supply steam that uses machine to steam; Thus, seek energy-conservationization of the equipment integral of steam plant etc.
And; All the time; Owing to make and evaporate steam again and close the valve state and involve preventing reliably of adverse current through promptly becoming for thirty years of age as quick as thought; Thereby the aforementioned safety check that makes intervention be installed on aforementioned attraction road is the structure (by the inherent flow characteristic of (a) among Fig. 2 expression) with following inherent flow characteristic: the Magnification that the valve opening along with safety check of flow increases, the little aperture district ratio little in valve opening is bigger in the big big aperture district of valve opening.For example, as shown in Figure 8, become the structure of valve gap portion 42 of the plate-like on plane for the face 42a that forms valve ports 41 sides at valve body 43.In addition, 44 for flowing into the road, and 45 for flowing out the road, and 46 are compression helical spring (an aforementioned example of ordering about device), and 47 is valve chamber, and 48 is the valve seat of ring-type.In addition, Fig. 8 (a) shows the valve state that closes, Fig. 8 (b) show flow (particularly, for after the C that states VValue) is about valve state of opening at 20% o'clock.
About this safety check shown in Figure 8; Owing to moving of the valve body 43 that causes along with fluid pressure by fluid; The area that is formed at the gap A1 of the ring-type between the valve seat 48 of valve seat abutting part (peripheral part of the lower surface 42a of valve gap portion 42) and ring-type of valve body 43 becomes the minimum area of the inflow path of fluid; Thereby the area decision of the gap A1 that passes through the ring-type of flow when driving valve of fluid; Because the Magnification that increases along with valve opening of the area of gap A1 diminishes along with the increase of valve opening gradually; Thereby the inherent flow characteristic with the type shown in (a) of Fig. 2, wherein, valve opening is based on the amount of movement (stroke) towards 48 the side of lifting off a seat of valve body 43.
In addition; In recent years; Below requiring simultaneously both: also utilize the evaporating steam again of minimum flow and further improve the energy-saving effect of equipment integral by the sucking action of vapor steam blaster, and according to steam use the classification of machine or possess steam use machine main equipment various situations such as classification or apparatus manager's purpose and the supply steam of machine etc. is used in control critically to steam.And the supply steam etc. that uses machine to this steam is controlled in the adjustment of the suction of vapor steam blaster being pressed by the adjustment of the aperture of reduction valve.
Patent documentation 1: TOHKEMY 2007-332859 communique
Summary of the invention
The problem that invention will solve
Yet; In above-mentioned existing steam supply system; Owing to get involved the increment rate that increases along with valve opening that the safety check be installed on aforementioned attraction road has flow at the little bigger inherent flow characteristic in little aperture district of valve opening; Thereby based on the minimum flow rate adjustable not too little (in other words, rangeability is not too wide) of the valve opening of this safety check.Therefore; In this steam supply system; Exist following problem: remain when quite low when pressing to the adjustment of valve opening and with the suction of vapor steam blaster, safety check takes place only open valve state and the unsure state (so-called trembling) of closing valve state (valve body repeatedly and knock valve seat) repeatedly, therefore by the reduction valve that evaporates steam again that should apply flexibly few flow; The suction of vapor steam blaster is pressed and is become unstable, and reduction valve becomes inaccurate to the control of steam.
The present invention makes in view of aforesaid actual conditions, and its major subjects is, aforesaid problem is eliminated in the rational improvement of the non-return portion through attracting the road effectively.
The means that are used to deal with problems
The 1st characteristic formation of the present invention relates to the steam supply system, it is characterized in that,
Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at aforementioned steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of aforementioned vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with aforementioned as the mode of the driving steam of vapor steam blaster with aforementioned reduction valve,
And, be installed on aforementioned attraction road with suppressing the safety check intervention of steam to the adverse current of aforementioned evaporating pot again,
Wherein, form temperature or the formation of the valve opening that pressure is adjusted aforementioned reduction valve of steam of supplying with the downstream side of the aforementioned vapor steam blaster in the road according to aforementioned steam,
And; Making aforementioned safety check is following structure: the Magnification that increases along with the valve opening of aforementioned safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps aforementioned Magnification compares in aforementioned big aperture district littler inherent flow characteristic in aforementioned little aperture district.
Promptly; According to above-mentioned formation, owing to compare with aforesaid existing system, the aforementioned Magnification of getting involved in the aforementioned little aperture district of the safety check that is installed on aforementioned attraction road is littler; Therefore; The minimum flow rate adjustable of opening under the valve state of safety check diminishes, and does not betide under the stable status of safety check aforesaid trembling, and can making more, the steam of evaporation again of small flow passes through.
So; Even press under the lower situation guaranteeing the suction of vapor steam blaster by the adjustment that should apply flexibly the aperture of the reduction valve that evaporates steam again of small flow more; The suction pressure that also can suppress vapor steam blaster becomes unstable owing to safety check trembles, can improve the precision of the steam control of reduction valve.
Therefore; In the above-mentioned formation of the temperature of the steam in the downstream side of supplying with the vapor steam blaster in the road according to steam or the valve opening that pressure is adjusted reduction valve; Owing to can control the temperature or the pressure of steam in the downstream side of vapor steam blaster accurately; Even thereby, also can utilize the high steam of energy-saving effect that evaporates steam again to supply with to needing the quilt steam use machine of the steam of control critically.
And; Owing to compare with aforesaid existing system; Aforementioned Magnification in the aforementioned big aperture district of aforesaid aforementioned safety check is bigger, thereby in the big aperture district that can not tremble, can corresponding to big the evaporating steam again of flow the steam of evaporation again of this big flow passed through apace apace.
Moreover, as previously mentioned, through suppressing the generation of trembling of safety check, thereby also can suppress to cause the wearing and tearing or the damage of the valve body or the valve seat of safety check owing to this generation of trembling, also can seek cheapization of the carrying cost of system.
The 2nd characteristic formation of the present invention relates to the steam supply system, it is characterized in that,
Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at aforementioned steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of aforementioned vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with aforementioned as the mode of the driving steam of vapor steam blaster with aforementioned reduction valve,
And, be installed on aforementioned attraction road with suppressing the safety check intervention of steam to the adverse current of aforementioned evaporating pot again,
Wherein, form the formation of the valve opening of adjusting aforementioned reduction valve according to the temperature of passing through steam or the pressure of aforementioned reduction valve,
And; Making aforementioned safety check is following structure: the Magnification that increases along with the valve opening of aforementioned safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps aforementioned Magnification compares in aforementioned big aperture district littler inherent flow characteristic in aforementioned little aperture district.
That is,, identical with aforesaid the 1st mode of execution according to above-mentioned formation; Owing to compare with aforesaid existing system; The aforementioned Magnification that intervention is installed in the aforementioned little aperture district of safety check on aforementioned attraction road is littler, and therefore, the minimum flow rate adjustable of opening under the valve state of safety check diminishes; Do not betide under the stable status of safety check aforesaid trembling, can making more, the steam of evaporation again of small flow passes through.
So; Even press under the lower situation guaranteeing the suction of vapor steam blaster by the adjustment that should apply flexibly the aperture of the reduction valve that evaporates steam again of small flow more; The suction pressure that also can suppress vapor steam blaster becomes unstable owing to safety check trembles, can improve the precision of the steam control of reduction valve.
Therefore; In above-mentioned formation according to the valve opening of adjusting aforementioned reduction valve through the temperature or the pressure of the steam in the aforementioned reduction valve; Since can be with reduction valve pass through steam (in other words; The driving steam of vapor steam blaster) temperature or pressure are controlled to and corresponding suitable temperature or pressure such as the structure of this vapor steam blaster or desired performance accurately, thereby can reach the high efficiency or the long lifetime of vapor steam blaster effectively.
And; Owing to compare with aforesaid existing system; Aforementioned Magnification in the aforementioned big aperture district of aforesaid aforementioned safety check is bigger, thereby in the big aperture district that can not tremble, can corresponding to big the evaporating steam again of flow the steam of evaporation again of this big flow passed through apace apace.
Moreover, as previously mentioned, through suppressing the generation of trembling of safety check, thereby also can suppress to cause the wearing and tearing or the damage of the valve body or the valve seat of safety check owing to this generation of trembling, also can seek cheapization of the carrying cost of system.
The 3rd characteristic formation of the present invention relates to the steam supply system, it is characterized in that,
Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at aforementioned steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of aforementioned vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with aforementioned as the mode of the driving steam of vapor steam blaster with aforementioned reduction valve,
And, be installed on aforementioned attraction road with suppressing the safety check intervention of steam to the adverse current of aforementioned evaporating pot again,
Wherein, form the formation of the valve opening of adjusting aforementioned reduction valve according to the temperature of evaporating steam again in the aforementioned evaporating pot again or pressure,
And; Making aforementioned safety check is following structure: the Magnification that increases along with the valve opening of aforementioned safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps aforementioned Magnification compares in aforementioned big aperture district littler inherent flow characteristic in aforementioned little aperture district.
That is,, constitute identical with aforesaid the 1st, the 2nd characteristic according to above-mentioned formation; Owing to compare with aforesaid existing system; The aforementioned Magnification that intervention is installed in the aforementioned little aperture district of safety check on aforementioned attraction road is littler, and therefore, the minimum flow rate adjustable of opening under the valve state of safety check diminishes; Do not betide under the stable status of safety check aforesaid trembling, can making more, the steam of evaporation again of small flow passes through.
So; Even press under the lower situation guaranteeing the suction of vapor steam blaster by the adjustment that should apply flexibly the aperture of the reduction valve that evaporates steam again of small flow more; Also can suppress the suction of vapor steam blaster and press the generation of trembling to become unstable, can improve the precision of the steam control of reduction valve owing to safety check.
Therefore; In the above-mentioned formation of the valve opening of adjusting aforementioned reduction valve according to the temperature of evaporating steam again in the aforementioned evaporating pot again or pressure; Since can will be again temperature of evaporating steam again or pressure in the evaporating pot be controlled to specified value accurately, thereby for example can avoid effectively owing to evaporating steam again than the more high unfavorable condition that causes evaporating again the utilization ratio reduction of steam of desired temperature or pressure.
And; Owing to compare with aforesaid existing system; Aforementioned Magnification in the aforementioned big aperture district of aforesaid aforementioned safety check is bigger, thereby in the big aperture district that can not tremble, can corresponding to big the evaporating steam again of flow the steam of evaporation again of this big flow passed through apace apace.
Moreover, as previously mentioned, through suppressing the generation of trembling of safety check, thereby also can suppress to cause the wearing and tearing or the damage of the valve body or the valve seat of safety check owing to this generation of trembling, also can seek cheapization of the carrying cost of system.
The 4th characteristic formation of the present invention relates to safety check, it is characterized in that,
For being used for the safety check that arbitrary characteristic that aforementioned the 1st～the 3rd characteristic constitutes constitutes the steam supply system of being put down in writing,
Form following structure: be provided with valve body; This valve body is connected to the ring-type of the outer periphery portion that is located at valve port with face the state in full week of valve seat is located in valve seat and valve port is closed valve; By the urging force that orders about device aforementioned valve body is ordered about to closing the valve side, and, flow into pressure by fluid and resist the aforementioned urging force that orders about device from aforementioned valve port; Valve body is driven valve to a side shifting of lifting off a seat with valve port
And; Be provided with flow control in the valve port side of valve body and use protuberance; This flow control with protuberance with when aforementioned valve body when leaving a side shifting of aforementioned valve seat; Guarantee to be formed at fluid is controlled in aforementioned flow control than the littler mode of area in the gap between valve seat abutting part that is formed at valve body and the valve seat with the area in the gap between the internal surface of protuberance and valve port the flow that passes through
Constitute the gabarit shape of aforementioned flow control with mode with protuberance with aforementioned inherent flow characteristic.
According to above-mentioned formation; Be provided with that the state in full week of valve seat that is connected to the ring-type of the outer periphery portion that is located at valve port with face is located in valve seat and valve port closed the valve body of valve; In contrast; Flow control by the valve port side that is formed at valve body has aforementioned inherent flow characteristic with the gabarit shape of protuberance; Therefore, can obtain also that full Zhou Jinhang face butt owing to the valve seat of the valve body abutting part of valve body and ring-type causes close valve the time high water-proof performance, and make aforementioned inherent flow characteristic performance with fault or the few stable status of misoperation.
The 5th characteristic of the present invention constitutes, and is the formation that is suitable for the enforcement of the 4th characteristic formation, it is characterized in that,
Be provided with the valve shaft that moves the aforementioned valve body of guiding along direction perpendicular to the opening surface of aforementioned valve port,
And, aforementioned flow control constituted with protuberance around the central shaft core of the opening surface of aforementioned valve port, have symmetry properties or roughly symmetric shape.
According to above-mentioned formation, at first, the valve shaft by move the aforementioned valve body of guiding along the direction perpendicular to the opening surface of aforementioned valve port can make by the inflow of fluid and press move (from closing the valve posture to opening moving of valve posture) of the valve body that causes to carry out efficiently.
And; Owing to aforementioned flow control constituted with protuberance around the central shaft core of the opening surface of aforementioned valve port, has symmetry properties (so-called rotational symmetry) or roughly symmetric shape; Thereby the inflow of bearing fluid when valve body presses and when the direction perpendicular to opening surface moves, and can utilize the inflow of this fluid to press and valve body is guaranteed to be prescribed form with the mode that the inflow of dealing with fluid at the inflow direction of fluid is equably pressed.
So; Can suppress effectively can guarantee desired performance for a long time because valve body produces the unfavorable condition of damaging or wearing and tearing from the change of the prescribed form of valve body at around the supporting portion of valve shaft or the interference position of interfering with valve shaft of waiting around the joint of valve shaft and valve body when moving.
The 6th characteristic of the present invention constitutes, and is the formation that is suitable for the enforcement of the 4th or the 5th characteristic formation, it is characterized in that,
Aforementioned flow control is constituted following gabarit shape with protuberance: aforementioned valve body near a side shifting of aforementioned valve seat in the moving process that is located in valve seat, do not contact with the inner peripheral surface or the valve seat of aforementioned valve port.
According to above-mentioned formation; Control the contact unfavorable condition that change with the inner peripheral surface of protuberance and valve port and valve seat with the external surface shape of protuberance owing to be accompanied by the fluid that closes valve events owing to can prevent fluid control, thereby can suppress to be accompanied by the reduction that fluid is controlled the precision of the flow control that the gabarit shape with protuberance changes.
Description of drawings
Fig. 1 is the pie graph that shows the 1st mode of execution of steam supply system.
Fig. 2 is the plotted curve of relation that shows valve opening and the flow of safety check.
Fig. 3 (a) is the sectional arrangement drawing that closes the valve state that shows safety check, (b) is the enlarged view of major component.
Fig. 4 (a) is the sectional arrangement drawing of opening the valve state that shows safety check, (b) is the enlarged view of major component.
Fig. 5 is the pie graph that shows the 2nd mode of execution of steam supply system.
Fig. 6 is the pie graph that shows the 3rd mode of execution of steam supply system.
Fig. 7 is the pie graph that shows another mode of execution of steam supply system.
Fig. 8 (a) is the sectional arrangement drawing that closes the valve state that shows existing safety check, (b) is the sectional arrangement drawing of opening the valve state that shows existing safety check.
Embodiment
[the 1st mode of execution]
Fig. 1 has shown that steams such as being used for steam plant uses the skeleton diagram of the steam supply system of equipment; Using the machine (not shown) to supply with steam S (in this example to steam; Steam for middle pressure or low pressure) steam is supplied with road 1 and is got involved installation reduction valve 3; And, supply with the downstream side of the reduction valve 3 on road 1 at steam and get involved installation vapor steam blaster 4.
The 2nd, make condensed water D1 (in this example, the condensed water of the high temperature that the steam that more adds high pressure than steam S of the serving as reasons produces) evaporating pot again of evaporation again, at this evaporating pot 2 again, connect the condensation flow approach 5 that condensed water D1 is flowed into.At the lower layer side of evaporating pot 2 again, the condensed water that the condensed water D2 after connection will be evaporated again discharges is discharged road 6.In addition, discharge road 6, get involved drain valve 7 is installed at condensed water.
And, by attracting road 9 to connect again the top regions of evaporating pot 2 and the attraction portion 8 of vapor steam blaster 4, and, attract road 9 at this, get involved and the inhibition steam is installed to the safety check 10 of the adverse current of evaporating pot 2 again.
Promptly; This steam supply system is following formation: with reduction valve 3 pass through steam S ' as the mode of the driving steam of vapor steam blaster 4 by vapor steam blaster 4 attract again in the evaporating pot 2 the steams of evaporation again and with mixes through steam S, and to this mixed vapour of steam use machine supply MA.
In addition; Be following formation: the pressure transducer 11 that will detect the pressure of mixed vapour MS is located at the downstream side that steam is supplied with the vapor steam blaster 4 in the road 1; And be electrically connected this pressure transducer 11 and aforementioned reduction valve 3; Adjust the valve opening of reduction valve 3 according to the checkout value of pressure transducer 11, make the pressure of mixed vapour MS become specified value (supplying with the example of formation of temperature or the valve opening that pressure is adjusted reduction valve 3 of steam in the downstream side of the vapor steam blaster 4 in the road 1 according to steam).
As aforementioned safety check 10, be preferably the safety check of following structure: have flow r and (in this example, be flow coefficient (C VValue)) inherent flow characteristic that the Magnification that increases along with valve opening (based on the valve opening of the amount of movement of valve body 24) d is identical with the big big aperture district of valve opening in the little little aperture district of valve opening d (inherent flow characteristic of representing by (b) among Fig. 2); Perhaps aforementioned Magnification compares in aforementioned big aperture district littler inherent flow characteristic (by the inherent flow characteristic of (c) among Fig. 2 expression) in aforementioned little aperture district; In this example, use the safety check of the structure of inherent flow characteristic with latter.
In addition, C VValue is the numerical value of the capacity of expression valve, particularly, is represented by following formula.
C V = Q ( G / Δp )
Q: flow (gal (US)/min)
G: proportion
Δ p: pressure reduction (1lbf/in2)
Promptly; In this steam supply system; Be installed on the safety check 10 that attracts road 9 as intervention, have aforementioned Magnification through employing and compare safety check in aforementioned little aperture district at the littler inherent flow characteristic in aforementioned big aperture district, thus can be with the little aforementioned Magnification in the little aperture district of safety check 10; But so that open the less mode of minimum adjustment amount under the valve state; Under the situation that does not betide safety check 10 of trembling, apply flexibly the steam of the evaporation again FS of few flow, and then can corresponding to the steam of evaporation again of big flow it passed through apace in the big aperture district that can not tremble with the big aforementioned Magnification in the aforementioned big aperture district.
Bottom at aforementioned reduction valve 3; So that condensed water is provided with gas-liquid separation machine 12 and drain valve 13 integratedly from the mode that the inflow steam S that flows into to reduction valve 3 separates; In addition; Be provided with connecting tube 14, will pass through the top district that condensed water D3 that gas-liquid separation machine 12 separates with drain valve 13 guides to evaporating pot 2 again this connecting tube 14.Thus, for supply with the extremely low formation of passing through steam S ' of incorporation rate of condensed water to the spray nozzle part (not shown) of the 4a of suction portion that is built in vapor steam blaster 4.In addition, the 15th, get involved the safety check 15 that is installed on connecting tube 14.
Like Fig. 3, shown in Figure 4; Intervention is installed on the aforementioned safety check 10 on aforementioned attraction road 9, will have valve chamber 16 in inside and assemble integratedly with airtight conditions with outlet side valve casing that flows out road 17 18 and the inlet side valve casing 21 roughly cylindraceous with the valve seat 23 that flows into road 19 and ring-type and constitute.
At aforementioned valve chamber 16, in valve body 24 is housed, this valve body 24 is located in valve seat 23 and can valve port 22 be closed valve with the state that face is connected to the full week of aforementioned valve seat 23, valve seat 23 is formed on the outer periphery portion that road 19 is opened on the valve port 22 of valve chamber 16 that flows into that makes.Between the valve body 24 and outlet side valve casing 18 in valve chamber 16, be provided with to closing the compression helical spring 25 (ordering about an example of device) that the valve side is ordered about valve body 24.
In addition, at aforementioned valve chamber 16, be provided with the valve shaft 26 that moves guiding valve body 24 along directions X perpendicular to the opening surface of valve port 22.A pair of bar-shaped the formation that this valve shaft 26 is given prominence in the both end sides of valve body 24 by the mode that becomes a straight line shape with the direction of passage (in this example, being aforementioned directions X) along fluid (in this example, for evaporating steam FS again).
The position of outflow road 17 sides in aforementioned valve chamber 16 is provided with a distolateral bearing 27, and this distolateral bearing 27 moves one distolateral (upper end side among the figure) of valve shaft 26 freely along the directions X perpendicular to the opening surface of valve port 22 and supports.Inside flowing into road 19 is provided with the other end side bearing 28, and this other end side bearing 28 supports along aforementioned directions X another of valve shaft 26 is distolateral sliding freely.
Promptly; This safety check 10 is essentially following structure: be in the valve state that closes (state shown in Figure 3) that valve port 22 is closed valve by the urging force of compression helical spring 25 in advance; Only when the fluid that bears regulation flow into to be pressed, flow into the urging force that compresses incompressible helical spring 25 by this fluid, valve body 24 moves to 23 the side (upper side among Fig. 3) of lifting off a seat; Thus, become the valve state of opening (state shown in Figure 4) of valve port 22 being driven valve.In addition, state shown in Figure 4 is C VValue is about 20% state.
Aforementioned valve body 24 is by integrally formed with protuberance 30 and aforementioned valve shaft 26 along the flange shape valve gap portion 29 of radially protruding of valve shaft 26, flow control; Flow control is outstanding at the middle position of the face of valve port 22 sides of valve gap portion 29 with teat 30; Thereby with when valve body 24 when lifting off a seat a side shifting of 23; Be formed at flow control and control again the flow that passes through of boil-off gas FS with the area of gap (opening surface) A2 between the internal surface of teat 30 and valve port 22 than the littler mode of area of gap (opening surface) A1 of the ring-type between valve seat abutting part that is formed at valve body 24 (particularly, the peripheral part of the lower surface of valve gap portion 29) and the valve seat 23.
Aforementioned flow control with the shape (particularly, gabarit shape) of protuberance 30 constitute have flow r the Magnification that increases along with valve opening d in aforementioned little aperture district than littler inherent flow characteristic (by the inherent flow characteristic of (c) expression of Fig. 2) in aforementioned big aperture district.In detail; Flow control constitutes valve port side half 30b of than valve gap side half 30a of convergent shape more sharp with the shape of protuberance 30; Make that the Magnification of area of the gap A2 that the Magnification of area of the gap A2 that locates to valve gap side half 30a of (first half among the figure) of the amount of movement of top side shifting with respect to valve body 24 is located than valve port side half 30b of (Lower Half among the figure) is littler; Particularly; Constitute at (in this example, for around the axle core of aforementioned directions X, around the axle core of valve shaft 26) around the central shaft core of the opening surface of valve port 22 and have the hemispherical or roughly hemispherical of symmetry properties (so-called rotational symmetry).
In addition; With flow control (promptly with the external diameter R1 of valve gap portion 29 sides of protuberance 30; Flow control is with protuberance 30 maximum diameters) constitute identical with the internal diameter R2 that flows into road 19; And, the inner edge portion of valve port 22 is carried out chamfering and that the internal diameter R3 of valve port 22 is constituted specific discharge control is big slightly with the external diameter R1 of valve gap portion 29 sides of protuberance 30, thus; Constitute: be located in the moving process of valve seat 23 until valve gap portion 29 to the side shifting near valve seat 23 at valve body 24, flow control does not all contact with the inner peripheral surface of protuberance 30 with inner peripheral surface, valve seat 23 and the inflow road 19 of valve port 22.
[the 2nd mode of execution]
Though in aforesaid the 1st mode of execution; Enumerate the pressure of steam of supplying with the downstream side of the aforementioned vapor steam blaster 4 in the road 1 according to aforementioned steam and adjusted the formation of the valve opening of aforementioned reduction valve 3, but also can be for adjust the formation of the valve opening of aforementioned reduction valve 3 according to the pressure that evaporate steam FS again in the aforementioned evaporating pot again 2.
In this mode of execution; As shown in Figure 5; Be following formation: at evaporating pot 2 again the pressure transducer 32 that detects again the pressure that evaporates steam FS again in the evaporating pot 2 is set, and, be electrically connected this pressure transducer 32 and aforementioned reduction valve 3; Adjust the valve opening of reduction valve 3 according to the checkout value of pressure transducer 32, make that again the pressure that evaporate steam FS again in the evaporating pot 2 become specified value.
In addition, because other formation is identical with the formation of in the 1st mode of execution, having explained, thereby at identical formation place, marks the number identical and omit its explanation with the 1st mode of execution.
[the 3rd mode of execution]
Though in aforesaid the 1st mode of execution; Enumerate the pressure of steam of supplying with the downstream side of the aforementioned vapor steam blaster 4 in the road 1 according to aforementioned steam and adjusted the formation of the valve opening of aforementioned reduction valve 3, but also can be for adjust the formation of the valve opening of aforementioned reduction valve 3 according to the pressure that passes through steam S ' of aforementioned reduction valve.
In this mode of execution; As shown in Figure 6, be following formation: supply with reduction valve 3 and the position between the vapor steam blaster 2 in the road 1 at steam, the pressure transducer 33 of the pressure that passes through steam S ' that detects reduction valve 3 is set; And; Be electrically connected this pressure transducer 33 and aforementioned reduction valve 3, adjust the valve opening of reduction valve 3, make that again the pressure that evaporate steam FS again in the evaporating pot 2 become specified value according to the checkout value of pressure transducer 33.
In addition, because other formation is identical with the formation of in the 1st mode of execution, having explained, thereby at identical formation place, marks the number identical and omit its explanation with the 1st mode of execution.
[another mode of execution]
Though in aforesaid each mode of execution; Enumerated the formation of adjusting the valve opening of aforementioned reduction valve 3 according to the checkout value of pressure transducer 11,32,33; But; For example, as shown in Figure 7, also can be for press the formation of the valve opening of mechanically adjusting aforementioned reduction valve 3 according to the guiding of passing guide pipe 34.
Though in aforesaid each mode of execution; Enumerated the formation of adjusting the valve opening of aforementioned reduction valve 3 according to the checkout value of pressure transducer 11,32,33; But; Because the pressure and temperature of saturated vapor shows certain relation, thereby also can replace pressure transducer for temperature transducer is set, and adjusts the formation of the valve opening of aforementioned reduction valve 3 according to the checkout value of this temperature transducer.
Though in aforesaid each mode of execution; Enumerated make aforementioned safety check 10 for the Magnification that increases along with valve opening d with flow r in aforementioned little aperture district than the situation of the structure of littler inherent flow characteristic (inherent flow characteristic shown in Fig. 2 (c)) in aforementioned big aperture district, but also can make the structure of aforementioned safety check 10 for the Magnification that increases along with valve opening d with the flow r inherent flow characteristic (inherent flow characteristic shown in Fig. 2 (b)) identical with the big big aperture district of valve opening d in the little little aperture district of valve opening d.
Aforementioned flow control is with the concrete formation of shape of protuberance 30 etc.; Be not limited to aforesaid hemispherically or roughly hemispherical, but can suitably change to coniform, circular cone shape, pyramidal, pyramid shape etc. with mode with desired inherent flow characteristic.
Though in aforesaid each mode of execution, enumerated the situation that device is made up of compression helical spring 25 of ordering about of safety check 10, also can constitute as valve constitution of urging force etc. by elastomers such as rubber or with gravity.
Though in aforesaid each mode of execution; Situation below having enumerated: flow control does not all contact with the inner peripheral surface of protuberance 30 with inner peripheral surface, valve seat 23 and the inflow road 19 of valve port 22 in the moving process of valve seat 23 to being located in until valve gap portion 29 near a side shifting of valve seat 23 at valve body 24 in order to constitute; Constitute with the internal diameter R2 that flow into road 19 identical with the external diameter R1 of valve gap portion 29 sides of protuberance 30 flow control; And the inner edge portion of valve port 22 carried out chamfering and that the internal diameter R3 of valve port 22 is constituted specific discharge control is big slightly with the external diameter R1 of valve gap portion 29 sides of protuberance 30; But, for example also can constitute flow control littler with the external diameter R1 of valve gap portion 29 sides of protuberance 30 than the internal diameter R3 of internal diameter R2 that flows into road 19 and valve port 22.
Utilize possibility on the industry
The present invention can be applicable to possess the various device that steam uses machine.
Symbol description
1 steam is supplied with the road
2 evaporating pots again
3 reduction valve
4 vapor steam blasters
4a attraction portion
9 attraction roads
10 safety check
22 valve ports
23 valve seats
24 valve bodies
25 order about device
26 valve shafts
Protuberance is used in 30 flow controls
The S steam
S ' reduction valve pass through steam
FS evaporates steam again
The MS mixed vapour
The d valve opening
The r flow
The A1 gap
The A2 gap

Claims (6)

1. steam supply system; Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at said steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of said vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with said as the mode of the driving steam of vapor steam blaster with said reduction valve,
And, be installed on said attraction road with suppressing the safety check intervention of steam to the adverse current of said evaporating pot again,
Wherein, form temperature or the formation of the valve opening that pressure is adjusted said reduction valve of steam of supplying with the downstream side of the said vapor steam blaster in the road according to said steam,
And; Making said safety check is following structure: the Magnification that increases along with the valve opening of said safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps said Magnification compares in said big aperture district littler inherent flow characteristic in said little aperture district.
2. steam supply system; Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at said steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of said vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with said as the mode of the driving steam of vapor steam blaster with said reduction valve,
And, be installed on said attraction road with suppressing the safety check intervention of steam to the adverse current of said evaporating pot again,
Wherein, form the formation of the valve opening of adjusting said reduction valve according to the temperature of passing through steam or the pressure of said reduction valve,
And; Making said safety check is following structure: the Magnification that increases along with the valve opening of said safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps said Magnification compares in said big aperture district littler inherent flow characteristic in said little aperture district.
3. steam supply system; Supply with the road at the steam that uses machine to supply with steam to steam and get involved the installation reduction valve; Supply with the downstream side of the reduction valve in the road at said steam and get involved the installation vapor steam blaster; And, by attracting the road to connect the attraction portion of said vapor steam blaster and the evaporating pot again that condensed water is evaporated again
Form with the steam that passes through and attract again evaporating steam again and constitute through what vapor phase was mixed in the evaporating pot by vapor steam blaster with said as the mode of the driving steam of vapor steam blaster with said reduction valve,
And, be installed on said attraction road with suppressing the safety check intervention of steam to the adverse current of said evaporating pot again,
Wherein, form the formation of the valve opening of adjusting said reduction valve according to the temperature of evaporating steam again in the said evaporating pot again or pressure,
And; Making said safety check is following structure: the Magnification that increases along with the valve opening of said safety check with flow is the big aperture district identical inherent flow characteristic big with valve opening in the little little aperture district of valve opening, and perhaps said Magnification compares in said big aperture district littler inherent flow characteristic in said little aperture district.
4. a safety check is used for each the described steam supply system according to claim 1 to 3,
Form following structure: be provided with valve body; This valve body is connected to the ring-type of the outer periphery portion that is located at valve port with face the state in full week of valve seat is located in valve seat and valve port is closed valve; By the urging force that orders about device said valve body is ordered about to closing the valve side, and, compress the anti-said urging force that orders about device by fluid inflow from said valve port; Valve body is driven valve to a side shifting of lifting off a seat with valve port
And; Be provided with flow control in the valve port side of valve body and use protuberance; This flow control with protuberance with when said valve body when leaving a side shifting of said valve seat; Guarantee to be formed at fluid is controlled in said flow control than the littler mode of area in the gap between valve seat abutting part that is formed at valve body and the valve seat with the area in the gap between the internal surface of protuberance and valve port the flow that passes through
Constitute the gabarit shape of said flow control with mode with protuberance with said inherent flow characteristic.
5. safety check according to claim 4 is characterized in that, is provided with the valve shaft that moves the said valve body of guiding along the direction perpendicular to the opening surface of said valve port,
And, said flow control constituted with protuberance around the central shaft core of the opening surface of said valve port, have symmetry properties or roughly symmetric shape.
6. according to claim 4 or 5 described safety check; It is characterized in that; Said flow control is constituted following gabarit shape with protuberance: said valve body near a side shifting of said valve seat in the moving process that is located in valve seat, do not contact with the inner peripheral surface or the valve seat of said valve port.
CN201080044694.9A 2009-09-28 2010-08-06 Steam supply system and check valve used for same Active CN102725537B (en)

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PCT/JP2010/063383 WO2011036956A1 (en) 2009-09-28 2010-08-06 Steam supply system and check valve used for same

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JP4665045B1 (en) 2011-04-06
EP2484918A4 (en) 2016-04-13
KR101780679B1 (en) 2017-09-21
EP2484918B1 (en) 2020-01-22
SG178917A1 (en) 2012-04-27
AU2010299261B2 (en) 2015-07-16
EP2484918A1 (en) 2012-08-08
US8881761B2 (en) 2014-11-11
KR20120079832A (en) 2012-07-13
AU2010299261A1 (en) 2012-03-15
CN102725537B (en) 2015-04-15
US20120234420A1 (en) 2012-09-20
JP2011069335A (en) 2011-04-07

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